Discovery 2. Manual — part 90

ENGINE MANAGEMENT SYSTEM - V8

REPAIRS 18-2-89

Sensor - Mass Air Flow (MAF)

$% 19.22.25

Remove

1. Disconnect multiplug from MAF sensor.
2. Loosen clip and release air intake hose from

MAF sensor.

Note: Pre 03 MY air intake hose illustrated.

3. Release 2 clips and remove MAF sensor from

air cleaner, remove and discard 'O' ring.

Refit

1. Fit new MAF sensor 'O' ring, position MAF

sensor to air cleaner and secure with clips.

CAUTION: Ensure 'O' ring is not displaced
during fitting.

2. Position air intake hose to MAF sensor and

secure with clip.

3. Connect multiplug to MAF sensor.

ENGINE MANAGEMENT SYSTEM - V8

18-2-90 REPAIRS

Throttle Body

$% 19.22.45

Remove

1. Loosen 3 clips securing air intake hose, release

air intake hose and position aside.

Note: Pre 03 MY air intake hose illustrated.

2. Disconnect throttle and cruise control cables

from throttle body.

3. Loosen clip securing breather hose and release

hose.

4. Disconnect multiplug from throttle body.
5. Position a container below the throttle body to

collect coolant spillage.

6. Loosen 2 clips securing coolant hoses to

throttle body and release hoses.

7. Remove 4 bolts securing throttle body to

plenum chamber.

8. Remove throttle body and discard gasket.

Refit

1. Clean plenum chamber and throttle body

mating faces.

2. Using a new gasket, position throttle body, fit

bolts and tighten to 9 Nm (7 lbf.ft).

3. Connect coolant hoses to throttle body and

secure clips.

4. Connect breather hose to throttle body and

secure clip.

5. Connect multiplug to throttle body.
6. Connect throttle and cruise control cables.

l

+

ENGINE MANAGEMENT SYSTEM

- V8, ADJUSTMENTS, Cable - cruise
control.

l

+

ENGINE MANAGEMENT SYSTEM

- V8, ADJUSTMENTS, Cable - throttle.

7. Position air intake hose and secure clips.
8. Top-up cooling system.

M19 2576A

1

ENGINE MANAGEMENT SYSTEM - V8

REPAIRS 18-2-91

Plenum chamber

$% 19.22.46

Remove

1. Remove upper manifold gasket.

+

MANIFOLDS AND EXHAUST

SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.

2. Remove 2 bolts securing throttle cable

abutment bracket and remove bracket.

3. Remove breather hose adaptor.
4. Remove 4 bolts securing plenum chamber to

upper manifold and remove plenum chamber.

5. Collect plenum chamber gaskets.

Refit

1. Clean plenum chamber and upper manifold

mating faces.

2. Using new gaskets, position plenum chamber

fit bolts and tighten to 22 Nm (16 lbf.ft).

3. Fit breather adaptor and tighten to 6 Nm (4.4

lbf.ft).

4. Position throttle cable abutment bracket, fit

bolts and tighten to 9 Nm (7 lbf.ft).

5. Fit upper manifold gasket.

+

MANIFOLDS AND EXHAUST

SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.

Sensor - throttle position (TP)

$% 19.22.49

Remove

1. Disconnect multiplug from TP sensor.
2. Remove 2 screws securing TP sensor to

throttle body.

3. Remove TP sensor and discard 'O' ring.

Refit

1. Clean TP sensor and throttle body mating

faces.

2. Using a new 'O' ring, position TP sensor. Fit

screws and tighten to 2.2 Nm (1.6 lbf.ft).

3. Connect multiplug to TP sensor.

ENGINE MANAGEMENT SYSTEM - V8

18-2-92 REPAIRS

Valve - idle air control (IACV)

$% 19.22.54

Remove

1. Disconnect multiplug from IACV.
2. Loosen 2 clips securing air hoses and release

hoses.

3. Remove 2 screws securing IACV to inlet

manifold.

4. Collect clamps and remove IACV.

Refit

1. Position IACV to inlet manifold, locate clamps,

fit screws and tighten to 8 Nm (6 lbf.ft).

2. Position air hoses to IACV and secure clips.
3. Connect multiplug to IACV.

Injectors

$% 19.60.12

Remove

1. Remove upper manifold.

+

MANIFOLDS AND EXHAUST

SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.

2. Carefully manoeuvre ignition coil assembly

from between inlet manifold and bulkhead.

3. Position absorbent cloth beneath fuel pipe to

catch spillage.

4. Disconnect fuel feed hose from fuel rail

CAUTION: Always fit plugs to open
connections to prevent contamination.

5. Release injector harness from fuel rail and

disconnect injector multiplugs.